Concrete posts cleaning

[JohnBishop]

Hi All,

 I hope you are doing well.

I have a front yard fence with short concrete posts.
Should I get someone so pressure wash it or should I wire brush it then paint it or sand the surface with flex grinder? Flex grinder cleaning is what I saw on the Internet.

Please advise

Thank you

Best regards

[ToughButterCup]

The end-in-mind is ?

Cleaning? Preserve rather than replace? Create a fungus garden? For each a different workflow .....

[markc]

Pressure wash! The surface will be pitted so dirt gets deep into the surface, yes you could grind off with a diamond disk but the work and resulting finish would be terrible. 

[Dave Jones]

sodium hypochlorate

[Iceverge]

2 hours ago, Dave Jones said:

sodium hypochlorate

 

+1.

 

Spray or brush on a dilute solution. Be careful with your skin and eyes obviously. 

 

Doing it in slightly damp/misty weather seems to help it soak in I find. Quite often just a rince with a bucket and brush once the chemicals have worked will do the trick but a pressure washer will make it a simple job. 

 

 

[JohnBishop]

On 11/03/2023 at 10:02, ToughButterCup said:

The end-in-mind is ?

Cleaning? Preserve rather than replace? Create a fungus garden? For each a different workflow .....

yes, preserve because I am not ready to replace it, perhaps this time I would replace with long posts

[JohnBishop]

On 11/03/2023 at 12:32, Dave Jones said:

sodium hypochlorate

do you mean just bleach?

 

22 hours ago, Iceverge said:

 

+1.

 

Spray or brush on a dilute solution. Be careful with your skin and eyes obviously. 

 

Doing it in slightly damp/misty weather seems to help it soak in I find. Quite often just a rince with a bucket and brush once the chemicals have worked will do the trick but a pressure washer will make it a simple job. 

 

 

what proportions 50/50?

 

Should I look for a pressure washer or get someone to do it? Obviously I have to avoid crap pressure washers. I have no experience.

Edited March 12, 2023 by JohnBishop

[Dave Jones]

https://www.ebay.co.uk/itm/285121580537?hash=item4262920df9:g:gikAAOSww75j0VRp&amdata=enc%3AAQAHAAAA8Oo2VkeYjPSaqtN7JVb1u5YOlFDX3CiTLo14RM0%2BlMepZHo6JoiEafYIbL0N2M3L5Zaft9uxo%2FNgtcJ%2B9aJLoDtQ5A%2FHMdBe0NWKZeP4RqKy5bKRSXpYYyY15J8HqDVfa5GjdbV33tfBLExBh20%2FA2yhAm9limeVMSBUdKaWo9GPv1yBC09ai81kplq9Wlml1Kp%2FThCNNEoGmSgrQbbhG1ueoqstXGrCSNeB6yWyaKNVNdty8Q2c9FtFDuV50ClaLYVYYIEEQdnr6aiTQ68I6xlJ9zGu4rFS0G0brDHTbM3WzHd%2FlnxNa%2FufNPwXjSnaqg%3D%3D|tkp%3ABk9SR7Ljy-HaYQ

 

[Iceverge]

1 hour ago, JohnBishop said:

what proportions 50/50?

 

Should I look for a pressure washer or get someone to do it? Obviously I have to avoid crap pressure washers. I have no experience.

 

It's been a while but I seem to remember much more dilute that that. Safer to start weak 90:10 maybe and up the dosage from there. 

 

 If it's just green algee a brush and a garden hose will shift it. Otherwise a cheap karcher or similar will get the job done. 

[Dave Jones]

neat on first application and let it sit.